Coffee-pot.



l PATENTED MAR. l2, 1907.

Gn F. W.' HOLMAN.

COFFEE POT.

APPLICATION FILED MAY 2, 190e.

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WTNESSES:

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GEORGE F. W. HOLMAN, OF PHILADELPHIA, PENNSYLVANIA.

COFFEE-POT.

Specification of Letters Patent.

Patented March 12, 1907.

Application filed May 2, 1906. Serial No. 314.740.

at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inlCoffee-Pots, of which the following is a specilication My inventionrelates to coffee-pots for making what is known as fboiled" coffee indistinction from what is termed drip or percolated coffee, the groundcoffee in my improved pot being wholly submerged in the water during theentire process of boiling.

While I here show anddescribe my invention for use in boiling coffee, itis understood that the invention is not restricted to'such use, beingavailable for general purposes of steeping and the extraction of juices.

My object is in the first instance to provide an apparatus whereby theprinciple of convection or circulation may be utilized in such mannerthat the ground coffee in the coffee-holder is removed and protectedfrom the scalding effects of direct ebullition while the process ofgradual infusion is in progress.

My object is, further, to provide a means whereby any desired quantityof boiled coffee from a minimum to the maximum capacity of the pot maybe prepared, and, lastly, I have sought to provide a coffee-pot simple.in construction, convenient in use, and. effective in operation, havingfew parts and these readily adjustable and removable for the purpose ofcleaning, and which shall do away with the employment of valves andother so-called pumping mechanism.

These` objects I accomplish by the means herein described, and shown inthe accompanying drawing, which is a view in vertical section of theentire coffee-pot.

The cylindrical body 1 of the pot is furnished with a base 3,.preferably in the form of a truncated cone. The base and body are joinedby a short cylindrical section 2, which rises somewhat above the bottomof the main body of the pot, the projecting portion of the cylindricalsection 2 forming a collar pierced by the openings or perforations 13.Thus the main body 1, the cylindrical section 2, and the base 3 formonecontinuous water-tight rece tacle.

The inner tufie or cylinder 4 is of wiregauze or perforated sheet metaland iits tightly over the projectingcollar of the cylindrical section 2above described, being thereby supported vertically in the center of themain body of the pot.

The annular coffee-holder 5 in the form-of a cored cylinder is of suchdiameter as to fit within the body of the pot and around the inner tube4. 'Ihe cover 6 and bottom 12 of the coffee-holder are of wire-guaze orperforated sheet nietal, and the sides thereof may be eitherimperforate, as shown, or of the same character as the cover and bottom.

The cover 7 of the pot is of ordinary form and is provided with thecentrally-located opening 8, in which is mounted the telescopic ro 9.with a light Wood or cork float 10 and at its upper end with a smallball or other indicator 11, the whole constituting what I term a easilybobber, being adapted to rise and fall in the opening 8 in the top ofthe cover 7.

The mode of operation of my improved coffee-pot is. as follows: Thecentral tube or cylinder 4, which is removable for the purpose ofcleaning, is fitted into position upon the collar of the cylindricalsection 2. The coffee-holder 5 is filled with the ground coffee, iscovered, and the holder slipped over the top of the tube 4 and pusheddownward thereon, the vertical adjustment being in accordance with thequantity of boiled' coifee to be made. The pot is filled with water to apoint covering the top of the coffee-holder 5, and the telescopic rod 9of the bobber is then adjusted so as to ermit the float 10 to rest uponthe surface o the water in the pot. Heat being then applied at the base3, convection ensues, the heated water rises through the central tube 4,passes over its top, thence Vdownward through the ground coffee in theholder, and into the annular space surrounding the central tube 4. Thecooler water from this annular space passes through the meshes of thetube 4 and down toward or into the base 3. This circulation orconvection, due to the difference of temperature at all moments betweenthe water in the base 8 and central tube 4 and the water in the annularspace surrounding the tube 4, continues not only until the waterin thebase 3 and tube 4 re aches a state of ebullition, but for the furthertime of boiling necessary to make the coffee infusion of properstrength. In the accompanying drawing the coffeeholder 5 is shown infull lines at its highest position, or, in other words, adjusted for themaximum capacity of the pot. The course of circulation above describedand for this This rod is furnished at its lower end IOO IOS

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position of the holder is indicated in the drawing by the arrows insolid line. When the coffee is boiled and ready to serve, the centraltube 4 and coffee-holder 5 may be drawn up together and removed from thepot.

It will be observed that at whatever point upward or downward upon thecentral tube 4 the coffee-holder 5 is adjusted for the purpose ofvarying the quantity of boiled coffee to be made, as above described,and whatever the consequent level of the water in the pot a freecirculation of the boiling water is secured through this perforated orwire-gauze tube. For example, a lower adjustment of the coffee-holder 5is indicated in dotted line in the drawing. In this case the boiling'water rising by convection in the central tube passes through the meshesor perforations thereof upon reaching the level of the water in the potinstead of passing over the top of the tube, as in the high positionshown and previously described. The course taken by the water incirculation is indicated for this lower position by the dotted arrows inthe drawing. Thus any lesser amount of boiled coffee than the maximummay be made by locating the coffee-holder upon the central tube 4 atsuch a height above the bottom of the pot that when the desired quantityof water is in the pot the water-level will be somewhat above the coverof the coffeeholder. The openings 13 in the projecting collar of thecylindrical section 2 at the bottom of the main body of the pot areprovided for a free convection of water down into the base 3 when thecoffee-holder is at its lowest position for making the minimum amount ofboiled coffee.

It remains to describe the function of what I term the bobber In boilingcoffee it is important to ascertain the moment when the boiling-point isinitially reached and ebullition takes place, for the length of time forwhich the coffee is to be boiled must be reckoned from that moment. Aspreviously stated, the float 10 rests upon the surface of the water, thetelescopic rod 9 passing up through the opening 8 in the cover 7 andknob 14 and being shortened or lengthened according to the level of thewater in the pot. WVhen the boiling-point is reached and ebullitiontakes place, the disturb ance of the sur- `face causes a rising andfalling of the oat, which motion is communicated by the rod to the ballor indicator 11, projecting above the cover of the pot. The desired lenth of boiling can thus be timed from the st movement of the bobber 11,and the exact beginning, duration, and energy of boiling is thusindicated without necessitating a removal of the cover.

It will be observed that there is no false bottom in my improved pot andno pressurechamber or pressure-tube, pressure not being employed inproducing or maintaining circulation. I/Vhile I have shown the base 3 ashaving the Aform of a truncated cone, it may be of any shape which willleave an air-space between its upper surface and the bottom of the mainbody of the pot.

I have illustrated and described with par ticularity the preferreddetails of construction and arrangement of the several parts; but it isto be understood that changes may be made and essential features of myinvention be retained.

I do not claim, broadly, an apparatus wherein for purposes of steepingthere is established a circulation of the water from a heatingebaseupward through a central tube and downward through the substance to besteeped, as I am aware that a variety of apparatus exist wherein thisprinciple is employed.

What I claim as my invention, and desire to secure by Letters Patent,is-

In a steeping apparatus, a pot-body, a heating-base exterior thereto, anannular collar connecting said pot-body and heatingbase and projectingabove the bottom of said pot-body, said projecting portion beingprovided with a plurality of' openings immediately above said bottom, anopen-topped central tube, reticulated throughout its length andremovably mounted upon theprojecting portion or neck of said annularcollar, and a reticulated annular receptacle for the substance to besteeped, mounted and adjustable at any desired height upon said centraltube, whereby the contents of said receptacle may be immersed andcirculation by convection secured at varying levels of the liquid insaid pot-body, substantially as and for the purposes described.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE F. W. I-IOLMAN. Witnesses:

LAURA BERGER, H. B. SCHERMERHORN.

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